CN112525539B - Automobile engine torque detection method and device and automobile environment bin - Google Patents
Automobile engine torque detection method and device and automobile environment bin Download PDFInfo
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- CN112525539B CN112525539B CN202011350323.5A CN202011350323A CN112525539B CN 112525539 B CN112525539 B CN 112525539B CN 202011350323 A CN202011350323 A CN 202011350323A CN 112525539 B CN112525539 B CN 112525539B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
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Abstract
The invention relates to the technical field of automobile engines, in particular to an automobile engine torque detection method and device and an automobile environment bin. The invention relates to a method for detecting the torque of an automobile engine, which comprises the steps of controlling the engine and a driving wheel of an automobile to be separated; controlling the rotating speed of the engine to a preset rotating speed; acquiring total torque of an engine at a preset rotating speed, and acquiring friction torque of the engine; an accessory torque of the engine is determined based on the total torque and the friction torque. Therefore, when the accessory torque is measured, the automobile is shifted into neutral gear in advance, so that the output torque of the flywheel end is 0, the total output torque and the friction torque of the engine are indirectly measured, the accessory torque at the preset rotating speed is further measured, the accessory torque is prevented from being directly estimated or measured to cause larger deviation or error, the measuring precision of the accessory torque can be greatly improved, and the accuracy of the whole automobile economical simulation can be improved.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method and a device for detecting torque of an automobile engine and an automobile environment bin.
Background
Currently, in the development process of automobiles, a test of the economy of the entire automobile is indispensable. In the whole vehicle economical simulation calculation, the input running resistance of the vehicle is wind resistance, rolling resistance, acceleration resistance, ramp resistance and internal resistance of a transmission system, and the vehicle accessory consumes a part of engine power, such as an engine cooling fan, a generator, an air compressor, a steering pump, a compressor and the like. In order to make the simulation result more accurate, it is generally necessary to input a torque corresponding to the accessory.
In the prior art, the determination of the accessory torque is limited to the following: 1) The accessory torque is usually determined in an estimated mode, and large deviation exists frequently; 2) The total torque is obtained by obtaining the required torque of accessories (a generator, a fan, an air compressor, a steering pump, a compressor and the like) and summing the required torque after compensation calculation, and the error is large because the transmission efficiency of the accessories is also involved, and the load rate of each accessory needs to be measured when the torque of each accessory is calculated.
Disclosure of Invention
The problem addressed by the present invention is how to more accurately determine the torque of an engine accessory.
In order to solve the above problems, the present invention provides a method for detecting torque of an engine of an automobile, comprising:
controlling the separation of an engine and a driving wheel of an automobile;
controlling the rotating speed of the engine to a preset rotating speed;
acquiring the total torque of the engine at the preset rotating speed, and acquiring the friction torque of the engine;
determining an accessory torque of the engine based on the total torque and the friction torque.
Therefore, when the accessory torque is measured, the automobile is shifted into neutral gear in advance, so that the output torque of the flywheel end is 0, the total output torque and the friction torque of the engine are indirectly measured, the accessory torque at the preset rotating speed is further measured, the accessory torque is prevented from being directly estimated or measured to cause larger deviation or error, the measuring precision of the accessory torque can be greatly improved, and the accuracy of the whole automobile economical simulation can be improved.
Optionally, the method further comprises:
controlling the preset rotating speed to gradually increase from the first preset rotating speed to the second preset rotating speed of the engine; acquiring the corresponding friction torque and total torque of the engine at different orders of rotating speeds; determining the accessory torque at different order rotational speeds from the friction torque and the total torque at different order rotational speeds.
Therefore, the friction torque and the total torque at different rotating speed step points are measured, the accessory torque at different rotating speed step points can be obtained, the accessory torque is closer to the actual situation, and different accessory torques can be obtained according to different speeds when simulation is carried out, so that the accuracy of the whole vehicle economical simulation is improved.
Optionally, the method further comprises:
and establishing a model for reflecting the relation between the accessory torque and the rotating speed of the engine according to the rotating speed of the rotating speeds of different orders and the accessory torque.
Therefore, when the whole vehicle economy simulation is carried out, the model reflecting the relation between the accessory torque and the rotating speed of the engine can be directly input, so that each speed corresponds to one accessory torque, and the precision of the whole vehicle economy simulation is further improved.
Optionally, before the controlling the rotation speed of the engine to the preset rotation speed, the method further includes: and arranging the whole vehicle in an automobile environment bin, adjusting the temperature of the automobile environment bin to a preset temperature, and keeping the preset temperature for a first preset time.
Therefore, before the accessory torque of the engine is acquired, the whole vehicle is immersed in the environment bin, so that the temperature during testing is more close to the temperature of the vehicle in the actual environment, and the interference of the environment temperature on the measurement accuracy is reduced.
Optionally, the method further comprises:
and controlling the temperature of the automobile environment bin to gradually rise from the first preset temperature to the second preset temperature, and obtaining accessory torque under different temperatures of the automobile environment bin.
Therefore, the friction torque and the total torque at different temperature step points are measured, the accessory torque at different temperature step points can be obtained, the accessory torque is closer to the actual situation, different accessory torques can be obtained for different temperatures when simulation is carried out, and the influence of the temperature on the result of the accessory torque is avoided.
Optionally, before the controlling the rotation speed of the engine to the preset rotation speed, controlling the temperature of the cab of the automobile to the normal temperature is further included.
Thus, by adjusting the temperature of the cab to room temperature, the temperature of the cab can be made closer to the actual ambient temperature of the cab, thereby reducing the influence of the temperature of the cab on torque measurement.
Optionally, the method further comprises the step of starting a rotary drum test bed, controlling a rotary drum of the rotary drum test bed to pretreat the wheel for a second preset time period at a pretreatment rotating speed, and the pretreatment comprises the step of applying torque to the wheel through the rotary drum.
Therefore, through the arrangement of the rotary drum test bed, the rotating speed of the rotary drum is controlled, and an action moment is applied to the wheels so as to simulate the actual road conditions, so that the environment during torque measurement is closer to the actual road environment, and the torque measurement result is more accurate.
Optionally, the method further comprises: and establishing connection between ECU calibration software and the automobile, and controlling the rotating speed of an engine of the automobile through the ECU calibration software.
Therefore, the rotation speed of the engine is controlled through the setting of the ECU calibration software, and the method is more convenient.
The invention provides an automobile engine torque detection device, comprising:
the control unit is used for controlling the separation of an engine and a driving wheel of the automobile;
the control unit is used for controlling the rotating speed of the engine to a preset rotating speed;
the acquisition unit is used for acquiring the total torque of the engine at the preset rotating speed and also used for acquiring the friction torque of the engine;
and the determining unit is used for determining the accessory torque of the engine according to the total torque and the friction torque.
Therefore, when the accessory torque is measured, the automobile is shifted into neutral gear in advance through the adjusting unit, so that the output torque of the flywheel end is 0, the total output torque and the friction torque of the engine are indirectly obtained through the obtaining unit, the accessory torque at the preset rotating speed is further measured, the accessory torque is prevented from being directly estimated or measured to cause larger deviation or error, the measuring precision of the accessory torque can be greatly improved, and the accuracy of the whole automobile economic simulation can be improved.
The invention provides an automobile environment bin, which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium stores a computer program, and the computer program realizes the automobile engine torque detection method when being read and run by the processor.
Therefore, the automobile engine accessory torque is measured through the automobile environment bin, and the computer program corresponding to the automobile engine torque detection method is stored through the computer readable storage medium, so that the stability of the computer program corresponding to the automobile engine torque detection method when being read and operated by the processor can be ensured.
Drawings
FIG. 1 is a flow chart of a method of detecting engine torque of an automobile in an embodiment of the invention;
FIG. 2 is a flow chart of a method of detecting engine torque of an automobile in another embodiment of the invention;
FIG. 3 is a flow chart of a method of detecting engine torque of an automobile in yet another embodiment of the invention;
fig. 4 is a block diagram showing a structure of an automobile engine torque detecting device in an embodiment of the present invention.
Reference numerals illustrate:
1-control unit, 2-acquisition unit, 3-determination unit.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the description of the present specification, the descriptions of the terms "embodiment," "one embodiment," and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or embodiment is included in at least one embodiment or illustrated embodiment of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same examples or implementations. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or implementations.
An embodiment of the present invention provides a method for detecting torque of an automobile engine, as shown in fig. 1, fig. 1 is a flowchart of the method for detecting torque of an automobile engine in this embodiment, including:
step S11: controlling the separation of an engine and a driving wheel of an automobile;
step S12: controlling the rotating speed of the engine to a preset rotating speed;
step S13: acquiring the total torque of the engine at the preset rotating speed, and acquiring the friction torque of the engine;
step S14: determining an accessory torque of the engine based on the total torque and the friction torque.
It should be noted that this experiment is carried out in the car environment storehouse, integrate temperature control device in the car environment storehouse, can be right the temperature in car environment storehouse is adjusted. In step S11, the engine and the drive wheel of the vehicle are controlled to be separated by a gear adjuster, and the transmission and the drive wheel are controlled to be separated, that is, the gear of the vehicle is shifted to the neutral gear, and at the same time, the vehicle speed is guaranteed to be reduced to 0. In one embodiment, a controller is built in the automobile, and when a neutral signal is acquired, a gear can be automatically shifted to the neutral position; in one embodiment, the gear position of the vehicle may be in neutral by manually adjusting the gear control.
In step S12, since the gear of the automobile is shifted to neutral, the adjustment of the engine speed cannot be achieved through the transmission, where the adjustment of the engine speed can be achieved through other software or a controller, and the engine speed can be achieved through an automobile calibration tool, for example, through an INCA, a CANape or other ECU calibration tools, where the instruction is given by INCA software, and INCA is a basic product under the ETAS flag, and can interact with other test platforms, HIL systems, and the like to achieve interface interaction; the method comprises the steps of firstly calibrating the rotating speed of an engine through INCA, and adjusting the rotating speed of the engine through INCA software after calibrating. The preset rotational speed refers to a specific rotational speed, for example, the accessory torque of the engine at 40km/h is measured here, and the preset rotational speed of the engine is set to 40km/h by calibration software.
In step S13, the total output torque of the engine may be measured on an engine mount in real time, and by providing a dynamometer on the engine mount, the dynamometer includes a pull pressure sensor, through which the measurement of the total torque of the engine may be achieved, where the pull pressure sensor is a torque measured while maintaining torque balance, and the measured torque may not truly reflect the engine output torque, and since the engine output torque exhibits periodic fluctuations, the engine output torque may be an average of the engine output torque in one period, that is, an equivalent average of the engine output torque.
In step S13, the friction torque of the engine refers to the torque generated by the friction between the piston rod and the piston cylinder, where the piston torque may be measured in real time, by dragging the piston cylinder or the piston rod by the dynamometer. Of course, in this embodiment, the friction torque may be measured in advance, and the information of the friction torque may be stored in the memory, and when the friction torque needs to be called, the information may be directly obtained from the memory.
In step S14, since the total torque of the engine includes the accessory torque, the friction torque, and the flywheel side torque, the vehicle is in neutral, and the flywheel side torque is 0, the accessory torque of the engine is equal to the difference between the total torque and the friction torque. Here, the total friction torque and the friction torque of the engine can be accurately measured through the dynamometer on the engine bench.
The advantage that sets up like this lies in, when carrying out the measurement of annex moment of torsion, with the car neutral gear in advance for the output moment of torsion of flywheel end is 0, measures total output moment of torsion and friction moment of torsion through indirect engine, and then realizes measuring the annex moment of torsion under the preset rotational speed, avoids directly estimating the annex moment of torsion or measuring and causes great deviation or error, thereby can improve the measurement accuracy of annex moment of torsion greatly, and then can improve the accuracy nature of whole car economic nature emulation.
Optionally, the method for detecting the torque of the automobile engine further comprises the step-by-step increase of the preset rotating speed from the first preset rotating speed to the second preset rotating speed of the engine; acquiring the corresponding friction torque and total torque of the engine at different orders of rotating speeds; determining the accessory torque at different orders of rotation speeds according to the friction torque at different orders of rotation speeds and the total torque.
Here, the first preset rotational speed is smaller than the second preset rotational speed, a plurality of rotational speed step points may be set between the first preset rotational speed and the second preset rotational speed, a difference between adjacent rotational speed step points is a step length, and the step length may be 50rpm, 100rpm, 150rpm, or 200rpm. That is, from the first preset rotational speed, each time the rotational speed is increased by one step, the friction torque and the total torque are measured, or the friction torque and the total torque are measured in advance, and the relation between the friction torque and the total torque and the rotational speed is stored in a memory, and when the friction torque and the total torque are required to be obtained, the friction torque and the total torque are directly obtained in the memory, and then the accessory torque at different steps of speeds is measured.
In this embodiment, the first preset speed may be an idle speed of the automobile engine, and the second preset speed may be a highest speed of the automobile engine, so that not only may accessory torques of the automobile engine at the idle speed and the highest speed be measured, but also the accessory torques at speed steps between the two may be measured respectively, so that the measurement of the accessory torques from the lowest speed to the highest speed of the engine is more complete.
The advantage of setting like this is that through measuring friction torque under the different rotational speed rank points with total torque, can realize obtaining the annex moment of torsion under the different rotational speed rank points for the annex moment of torsion is closer to actual conditions, when carrying out the simulation, can obtain different annex moment of torsion to different speeds, thereby improves whole car economic nature simulation's precision.
Optionally, the method for detecting the torque of the automobile engine further comprises the step of building a model for reflecting the relation between the accessory torque and the rotating speed of the engine according to the rotating speed of the rotating speeds of different orders and the accessory torque.
In this embodiment, since the accessory torque at different speed step points has been obtained, here, the relationship between the rotational speed of different step rotational speeds and the accessory torque may be fitted by a curve fitting method, so as to establish a model between the accessory torque and the rotational speed of the engine, and when the economy simulation of the whole vehicle is performed, the model reflecting the relationship between the accessory torque and the rotational speed of the engine may be directly entered, so that each speed corresponds to one accessory torque, thereby further improving the accuracy of the economy simulation of the whole vehicle.
An embodiment of the present invention provides a method for detecting torque of an automobile engine, as shown in fig. 2, fig. 2 is a flowchart of the method for detecting torque of an automobile engine in this embodiment, including:
step S21: controlling the separation of an engine and a driving wheel of an automobile;
step S22: the method comprises the steps of placing the whole vehicle in an automobile environment cabin, adjusting the temperature of the automobile environment cabin to a preset temperature, and keeping the preset temperature for a first preset time period;
step S23: controlling the rotating speed of the engine to a preset rotating speed;
step S24: acquiring the total torque of the engine at the preset rotating speed, and acquiring the friction torque of the engine;
step S25: determining an accessory torque of the engine based on the total torque and the friction torque.
That is, before the measurement of the total torque and the friction torque is performed, the temperature of the vehicle environmental chamber is adjusted to a preset temperature, which is a specific temperature, for example, the accessory torque of the engine at 20 ℃ is required to be measured, and the temperature of the vehicle environmental chamber is adjusted to 20 ℃. The first preset time length is the initial set time length, and after the first preset time length is kept in the automobile environment bin, the temperature of the whole automobile tends to be balanced, so that the automobile environment is closer to the actual environment of the automobile. Here, the value of the first preset time period is not particularly limited, and the first preset time period is between 8h and 15h, preferably, the first preset time period is 12h. By limiting specific duration, the time is prevented from being too short, and the overall temperature of the automobile is greatly unbalanced, so that a certain error exists between a measurement result and a result in an actual environment.
It should be noted that, in a certain case, the whole vehicle may be first placed in an automobile environment cabin, the temperature of the automobile environment cabin is adjusted to a preset temperature, and the preset temperature is maintained for a first preset time period; and then the gear of the automobile is adjusted to the neutral gear.
The advantage of this arrangement is that the whole vehicle is immersed in the environmental chamber before the accessory torque of the engine is acquired, so that the temperature during testing is more close to the temperature of the vehicle in the actual environment, and the interference of the environmental temperature on the measurement accuracy is reduced.
Optionally, the method for detecting the torque of the automobile engine further comprises the step-by-step increase of the temperature of the automobile environment cabin from a first preset temperature to a second preset temperature, and the accessory torque under different temperatures of the automobile environment cabin is obtained.
Here, the first preset temperature is less than the second preset temperature, a plurality of temperature step points may be set between the first preset temperature and the second preset temperature, a difference between adjacent temperature step points is a temperature step, and the temperature step may be 10 ℃, 15 ℃, 20 ℃, or 25 ℃. That is, each time the temperature increases by one temperature step from the first preset temperature, the friction torque and the total torque are measured, or the friction torque and the total torque are measured in advance, and the relation between the friction torque and the total torque and the rotational speed, respectively, is stored in a memory, and when the friction torque and the total torque need to be obtained, the friction torque and the total torque are directly obtained in the memory, and then the accessory torque at different step temperatures is measured, respectively.
In this embodiment, the first preset temperature may be a minimum temperature that can be reached by the vehicle environment cabin, and the second preset temperature may be a maximum temperature that can be reached by the vehicle environment cabin. Here, the first preset temperature may be-20 ℃ and the second preset temperature may be 40 ℃, whereby the accessory torque at any temperature step point between-20 ℃ and 40 ℃ may be measured, respectively. Preferably, the accessory torque can be measured at-20 ℃, -5 ℃, 0 ℃, 15 ℃, 25 ℃ and 40 ℃, respectively.
The advantage of setting up like this is that through measuring friction torque under the different temperature rank point with total torque, can realize obtaining the annex moment of torsion under the different temperature rank point for the annex moment of torsion is closer to actual conditions, when carrying out the simulation, can obtain different annex moment of torsion to different temperatures, avoids the temperature to produce the influence to the result of annex moment of torsion.
Optionally, before the controlling the rotation speed of the engine to the preset rotation speed, the method for detecting the torque of the engine of the automobile further comprises controlling the temperature of the cab of the automobile to be normal temperature.
It can also be said that after said adjusting the temperature of the cabin of the vehicle to a preset temperature, maintaining said preset temperature for a first preset period of time, the temperature of the cabin of the vehicle is adjusted to a normal temperature, where the normal temperature may be 20 ℃ or 25 ℃. An air conditioner is arranged in the automobile cab, and the temperature in the cab can be adjusted by refrigerating or heating the air conditioner.
The advantage of this is that by adjusting the temperature of the cab to room temperature, the temperature of the cab can be made closer to the actual ambient temperature of the cab, thereby reducing the effect of the temperature of the cab on the torque measurement.
Optionally, the method for detecting torque of the automobile engine further comprises starting a rotary drum test bed, and controlling a rotary drum of the rotary drum test bed to pretreat the wheels for a second preset time period at a pretreatment rotating speed, wherein the pretreatment comprises the step of applying torque to the wheels through the rotary drum.
The rotary drum test bed is located in the automobile environment bin, and the rotating speed of the rotary drum is controlled, so that the resistance of the automobile on the road is simulated, and the actual measurement environment is closer to the actual running environment of the automobile. Here, the second preset duration may be preset, and the second preset duration may be 30min, 40min, 50min or 60min, so that unstable actual working conditions of the automobile caused by too short pretreatment time can be avoided through setting the preset duration.
The advantage of setting like this is that through the setting of rotary drum test bench, control the rotational speed of rotary drum, exert an action moment for the wheel to simulate actual road conditions, the environment when making the torque measurement is closer to actual road environment, makes the torque measurement's result more accurate.
Optionally, the method for detecting torque of an engine of an automobile further comprises: and establishing connection between ECU calibration software and the automobile, and controlling the rotating speed of an engine of the automobile through the ECU calibration software.
The rotating speed of the automobile engine can be realized through INCA, CANape or other ECU calibration tools, and the INCA is described by INCA software, is a basic product belonging to ETAS flag, and can realize interface interaction with other test platforms, HIL systems and the like; the method comprises the steps of firstly calibrating the rotating speed of an engine through INCA, and adjusting the rotating speed of the engine through INCA software after calibrating.
Therefore, the rotation speed of the engine is controlled through the setting of the ECU calibration software, and the method is more convenient.
In an embodiment of the present invention, as shown in fig. 3, fig. 3 is a flowchart of an automobile engine torque detection method in the present embodiment, where the automobile engine torque detection method specifically includes:
step S31: the method comprises the steps of placing the whole vehicle in an automobile environment bin, adjusting the temperature of the automobile environment bin to a preset temperature, and keeping the preset temperature for a first preset time period;
step S32: the whole vehicle is connected by ECU calibration software;
step S33: starting an engine, adjusting the temperature of a cab of the automobile to normal temperature, preprocessing a driving wheel of the automobile through a rotary drum, and controlling the speed of the rotary drum to be the preprocessing rotating speed for a second preset time period;
step S34: adjusting the gear of the automobile to a neutral gear, and controlling the rotating speed of the engine to gradually rise from idling to the highest rotating speed of the engine through ECU calibration software;
step S35: when the output torque of the engine at each step point shows periodic variation, acquiring the total torque of the engine at the preset rotating speed, and acquiring the friction torque of the engine;
step S36: determining an accessory torque of the engine from the total torque and the friction torque;
step S37: generating an accessory torque-rotating speed curve at the preset temperature.
Therefore, before the measurement of the accessory torque, the temperature of an automobile environment bin is adjusted, after the first preset time period of the automobile is immersed, the temperature of an automobile cab is reached to normal temperature, and meanwhile, the driving wheel is preprocessed, so that the automobile condition is close to the actual running condition. When the accessory torque is measured, the automobile is shifted into neutral gear in advance, so that the output torque of the flywheel end is 0, the total output torque and the friction torque of the engine are indirectly measured, the accessory torque at the preset rotating speed is further measured, the accessory torque is prevented from being directly estimated or measured to cause larger deviation or error, the measuring precision of the accessory torque can be greatly improved, and the accuracy of the whole automobile economic simulation can be improved.
Preferably, the method for detecting the torque of the automobile engine comprises the following steps:
placing the whole vehicle in an automobile environment bin, adjusting the temperature of the automobile environment bin to minus 20 ℃, and keeping the preset temperature for soaking the vehicle for at least 12 hours;
the whole vehicle is connected by ECU calibration software;
starting an engine, starting a heating mode, adjusting the temperature of a cab of the automobile to 25 ℃, preprocessing a driving wheel of the automobile through a rotary drum, controlling the speed of the rotary drum to be 50km/h, and lasting for 40min;
adjusting the gear of the automobile to a neutral gear, and controlling the rotating speed of the engine to gradually rise from idling to the highest rotating speed of the engine through ECU calibration software, wherein the rotating speed of the engine rises by 100rpm per step;
when the output torque of the engine at each step point shows periodic variation, acquiring the total torque of the engine at the preset rotating speed, and acquiring the friction torque of the engine;
determining an accessory torque of the engine from the total torque and the friction torque;
generating an accessory torque-rotating speed curve at minus 20 ℃;
placing the whole vehicle in an automobile environment bin, adjusting the temperature of the automobile environment bin to minus 5 ℃, and keeping the preset temperature for soaking the vehicle for at least 12 hours;
the whole vehicle is connected by ECU calibration software;
starting an engine, starting a heating mode, adjusting the temperature of a cab of the automobile to 25 ℃, preprocessing a driving wheel of the automobile through a rotary drum, controlling the speed of the rotary drum to be 50km/h, and lasting for 40min;
adjusting the gear of the automobile to a neutral gear, and controlling the rotating speed of the engine to gradually rise from idling to the highest rotating speed of the engine through ECU calibration software, wherein the rotating speed of the engine rises by 100rpm per step;
when the output torque of the engine at each step point shows periodic variation, acquiring the total torque of the engine at the preset rotating speed, and acquiring the friction torque of the engine;
determining an accessory torque of the engine from the total torque and the friction torque;
generating an accessory torque-rotating speed curve at minus 5 ℃;
placing the whole vehicle in an automobile environment bin, adjusting the temperature of the automobile environment bin to 15 ℃, and keeping the preset temperature for soaking the vehicle for at least 12 hours;
the whole vehicle is connected by ECU calibration software;
starting an engine, starting a heating mode, adjusting the temperature of a cab of the automobile to 25 ℃, preprocessing a driving wheel of the automobile through a rotary drum, controlling the speed of the rotary drum to be 50km/h, and lasting for 40min;
adjusting the gear of the automobile to a neutral gear, and controlling the rotating speed of the engine to gradually rise from idling to the highest rotating speed of the engine through ECU calibration software, wherein the rotating speed of the engine rises by 100rpm per step;
when the output torque of the engine at each step point shows periodic variation, acquiring the total torque of the engine at the preset rotating speed, and acquiring the friction torque of the engine;
determining an accessory torque of the engine from the total torque and the friction torque;
generating an accessory torque-rotating speed curve at 15 ℃;
placing the whole vehicle in an automobile environment bin, adjusting the temperature of the automobile environment bin to 25 ℃, and keeping the preset temperature for soaking the vehicle for at least 12 hours;
the whole vehicle is connected by ECU calibration software;
starting an engine, adjusting the temperature of a cab of the automobile to 25 ℃, preprocessing a driving wheel of the automobile by a rotary drum, and controlling the speed of the rotary drum to be 50km/h for 40min;
adjusting the gear of the automobile to a neutral gear, and controlling the rotating speed of the engine to gradually rise from idling to the highest rotating speed of the engine through ECU calibration software, wherein the rotating speed of the engine rises by 100rpm per step;
when the output torque of the engine at each step point shows periodic variation, acquiring the total torque of the engine at the preset rotating speed, and acquiring the friction torque of the engine;
determining an accessory torque of the engine from the total torque and the friction torque;
generating an accessory torque-rotating speed curve at 25 ℃;
placing the whole vehicle in an automobile environment bin, adjusting the temperature of the automobile environment bin to 40 ℃, and keeping the preset temperature for soaking the vehicle for at least 12 hours;
the whole vehicle is connected by ECU calibration software;
starting an engine, starting a refrigeration mode, adjusting the temperature of a cab of the automobile to 25 ℃, preprocessing a driving wheel of the automobile through a rotary drum, and controlling the speed of the rotary drum to be 50km/h for 40min;
adjusting the gear of the automobile to a neutral gear, and controlling the rotating speed of the engine to gradually rise from idling to the highest rotating speed of the engine through ECU calibration software, wherein the rotating speed of the engine rises by 100rpm per step;
when the output torque of the engine at each step point shows periodic variation, acquiring the total torque of the engine at the preset rotating speed, and acquiring the friction torque of the engine;
determining an accessory torque of the engine from the total torque and the friction torque;
an accessory torque-speed curve at 40 ℃ was generated.
Therefore, the accessory torque of the automobile engine at different ambient cabin temperatures at different rotating speed step points is measured sequentially, accessory torque-rotating speed curves at different ambient temperatures are respectively established, the relation between the accessory torque and the engine rotating speed and the ambient temperature is established, and when the magnitude of the accessory torque needs to be obtained, the value of the accessory torque can be directly obtained according to the magnitude of the current rotating speed.
An embodiment of the present invention provides an automobile engine torque detecting device, as shown in fig. 4, fig. 4 is a flowchart of the automobile engine torque detecting device in this embodiment, including:
the control unit is used for controlling the separation of an engine and a driving wheel of the automobile;
the control unit is used for controlling the rotating speed of the engine to a preset rotating speed;
the acquisition unit is used for acquiring the total torque of the engine at the preset rotating speed and also used for acquiring the friction torque of the engine;
and the determining unit is also used for determining the accessory torque of the engine according to the total torque and the friction torque.
When the accessory torque is measured, the automobile is shifted into neutral gear in advance through the adjusting unit, so that the output torque of the flywheel end is 0, the total output torque and the friction torque of the engine are indirectly obtained through the obtaining unit, the accessory torque at the preset rotating speed is measured, the accessory torque is prevented from being estimated or measured directly, larger deviation or error is caused, the measuring precision of the accessory torque is greatly improved, and the accuracy of the whole automobile economic simulation can be improved.
Optionally, the control unit is further configured to control the preset rotation speed to increase stepwise from a first preset rotation speed to a second preset rotation speed of the engine;
the acquisition unit is also used for acquiring the friction torque and the total torque corresponding to the engine at different orders of rotating speeds;
the acquisition unit is further configured to determine the accessory torque at different order rotational speeds from the friction torque and the total torque at different order rotational speeds.
Optionally, the engine further comprises a construction unit for building a model reflecting the relation between the accessory torque and the rotating speed of the engine according to the rotating speed magnitudes of the rotating speeds of different orders and the accessory torque.
Optionally, the adjusting unit is further configured to adjust the temperature of the environmental chamber of the automobile to a preset temperature, and maintain the preset temperature for a first preset period of time.
Optionally, the control unit is further configured to control the temperature of the automobile environmental chamber to gradually increase from a first preset temperature to a second preset temperature, and the acquisition unit is further configured to acquire the accessory torque at the temperature of the different automobile environmental chambers.
Optionally, the control unit is further configured to control the temperature of the cab of the automobile to a normal temperature.
Optionally, the control unit is further configured to control a drum of the drum test stand to pretreat the wheel for a second preset period of time at a pretreat rotational speed, where the pretreat includes applying a torque to the wheel through the drum.
Embodiments of the present invention also provide an automotive environmental chamber comprising a processor and a computer readable storage medium storing a computer program which, when read and run by the processor, implements the automotive engine torque detection method as described in any one of the above.
The technical solution of the embodiment of the present invention may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a readable storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or processor to perform all or part of the steps of the method of the embodiment of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.
The automobile engine accessory torque is measured through the automobile environment bin, and the computer program corresponding to the automobile engine torque detection method is stored through the computer readable storage medium, so that the stability of the computer program corresponding to the automobile engine torque detection method when being read and operated by the processor can be ensured.
Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the invention.
Claims (8)
1. A method for detecting torque of an engine of an automobile, comprising:
controlling the separation of an engine and a driving wheel of an automobile;
controlling the rotating speed of the engine to gradually increase from a first preset rotating speed to a second preset rotating speed through an automobile calibration tool, wherein the first preset rotating speed is the idling speed of the engine, and the second preset rotating speed is the highest rotating speed of the engine;
measuring corresponding friction torque and total torque of the engine at different orders of rotating speeds in real time;
determining accessory torque at different orders of rotation speeds of the engine according to the total torque and the friction torque at different orders of rotation speeds;
and establishing a model for reflecting the relation between the accessory torque and the rotating speed of the engine according to the rotating speed of the rotating speeds of different orders and the accessory torque.
2. The method for detecting torque of an automobile engine according to claim 1, characterized by further comprising, before said controlling the rotational speed of the engine to a preset rotational speed: and arranging the whole vehicle in an automobile environment bin, adjusting the temperature of the automobile environment bin to a preset temperature, and keeping the preset temperature for a first preset time.
3. The automobile engine torque detection method according to claim 2, characterized by further comprising:
and controlling the temperature of the automobile environment bin to gradually rise from the first preset temperature to the second preset temperature, and obtaining accessory torque under different temperatures of the automobile environment bin.
4. The method according to claim 2, further comprising controlling a temperature of a cab of the automobile to a normal temperature before the controlling the rotational speed of the engine to a preset rotational speed.
5. The method of claim 2, further comprising opening a drum test stand, controlling a drum of the drum test stand to precondition a wheel for a second predetermined period of time at a preconditioning rotational speed, the preconditioning comprising applying torque to the wheel via the drum.
6. The automobile engine torque detection method according to claim 1, characterized by further comprising: and establishing connection between ECU calibration software and the automobile, and controlling the rotating speed of an engine of the automobile through the ECU calibration software.
7. An automobile engine torque detection device, characterized by comprising:
the control unit is used for controlling the separation of an engine and a driving wheel of the automobile;
the control unit is also used for controlling the rotating speed of the engine to gradually increase from a first preset rotating speed to a second preset rotating speed through an automobile calibration tool, wherein the first preset rotating speed is the idling speed of the engine, and the second preset rotating speed is the highest rotating speed of the engine;
the acquisition unit is used for measuring the corresponding friction torque and total torque of the engine at different orders of rotating speeds in real time;
a determining unit for determining an accessory torque at different orders of rotation speeds of the engine according to the total torque and the friction torque at different orders of rotation speeds;
and the construction unit is used for establishing a model for reflecting the relation between the accessory torque and the rotating speed of the engine according to the rotating speed of the rotating speeds of different orders and the accessory torque.
8. An automotive environmental cabin characterized by comprising a computer-readable storage medium storing a computer program and a processor, which computer program, when read and run by the processor, implements the automotive engine torque detection method of any one of claims 1-6.
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| CN114088406B (en) * | 2021-11-30 | 2024-03-12 | 浙江吉利控股集团有限公司 | Calibration method, device and equipment for engine cold start and computer storage medium |
| CN114623009B (en) * | 2022-03-16 | 2023-05-23 | 东风汽车集团股份有限公司 | Engine torque regulation and control method and device, electronic equipment and storage medium |
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